抄録
Ryukyu limestone formation belonging the Quaternary Era is wide spreadly distributed over Ryukyu archipelago. The sea shores constituted by Ryukyu limestone formation is generally steep and it often forms overhanging cliffs. It also contains many karstic caves. Overhanging cliffs and karstic caves cause engineering and social problems particularly in urbanized areas in addition to seashores and riversides. The authors are concerned with the stability of cliffs constituted by Ryukyu limestone formation along the seashores in Ryukyu Islands archipelago and they present some analytical methods and numerical analyses for the stability assessment of overhanging cliff subjected to gravitational and seismic loads. These methods are applied to some actual observations on seashore cliffs in several islands. They compared the case studies with estimations and discussed the possibility of estimating tensile strength of rock.
